Just think if every billboard was not only capable of displaying the marketing message but doubling as a power plant. It's the first solar billboard-roofed with 20 solar panels installed in San Francisco that produces more energy than used. During an average sunny day, it can produce enough electricity to take care of an average family home for the day, or about 3.4 kilowatts & on a cloudy day its about 2.5 kilowatts of power, although the billboard does borrow electricity at night.